Wednesday, October 27, 2021

FormBook Adds Latest Office 365 0-Day Vulnerability CVE-2021-40444 to Its Arsenal

Trend Micro detected a new campaign using a recent version of the known FormBook malware, an infostealer that has been around since 2016. Several analyses have been written about FormBook in the last few years, including the expanded support for macOS. FormBook is famous for highly obfuscated payloads and the use of document CVE exploitation. Until recently, FormBook mostly exploited CVE- 2017-0199, but newer FormBook variants used the recent Office 365 zero-day vulnerability, CVE-2021-40444.

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